IP address still showing in address bar after domain resolves

I have a domain, ‘example.com’, registered with Bluehost. I also have a droplet with DigitalOcean. Now, I’ve re-pointed the nameservers to use CloudFlare. Great.

After adding the DNS entries, I go to a browser and type in ‘example.com’ … it properly resolves to the correct IP address of the correct Droplet.

But: in the browser bar, upon resolution and display of the Droplet’s server page, the address bar then stops displaying the domain - and, instead, exposes the IP address.

I have tried a 1000 different configurations - including trying same for a subdomain.

However, nothing seems to correct the problem, preserve the domain/subdomain in the address bar, and not display the IP address.

Here’s what I get: Domain: www.example.com/index.html --> xxx.xxx.xxx.xxx/index.html Subdomain: subdomain.example.com/index.html --> xxx.xxx.xxx.xxx/index.html

What am I doing wrong??